Slur preventer for printing presses



A ril 19, 1938' SLUR FREVENTER FOR PRINTING PRESSE'S Filed NOV. 2, 1936 In ventor fiaZberzZZ'ZwWz,

Patented Apr. 19, 1938 UNITED STATES PATENT OFFlCE 1 Claim.

This invention relates to slur preventers for cylinder printing presses of a generally similar nature to that constituting the subject matter of U. S. Patent Number 1,995,426, issued on March 26, 1935, upon which device the present invention constitutes a distinct improvement.

An important object of the present invention is to provide, in a manner as hereinafter set forth, a slur preventer of the aforementioned character embodying a novel construction and arrangement through the medium of which the device is adapted to be successfully used on various sizes of presses and in forms or chases of different widths.

Other objects of the invention are to provide a slur preventer of the character described for cylinder printing presses which will be comparatively simple in construction, strong, durable, highly eflicient and reliable in use, compact and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawing wherein like characters of reference designate corresponding parts throughout the several views, and wherein:

Figure 1 is a fragmentary view in top plan of a portion of a chase or type form, showing a slur preventer constructed in accordance with the present invention mounted therein.

Figure 2 is a View principally in vertical longitudinal section through the device.

Figure 3 is an enlarged view in vertical longitudinal section through one end portion of the device.

Figure 4 is a fragmentary View in vertical section, showing the device just before it is actuated to operative position.

Referring now to the drawing in detail, it will be seen that the embodiment of the invention which has been illustrated comprises an elongated bar I of suitable material, preferably metal, said bar being polygonal in cross section. Formed in one end portion of the bar I is a cylindrical socket 2 in which a plunger 3 is mounted for vertical reciprocation, said plunger being provided, on its upper end, with a substantially anticlinal head 4. The plunger 3 is yieldingly held in raised position through the medium of a coil spring 5 in the socket 2, said plunger being formed to provide a socket 6 for the reception of the upper portion of said coil spring.

Formed longitudinally in the bar I and extending from the top to the bottom thereof is a slot '1 which communicates, at one end, with the socket 2. Mounted for swinging movement in the slot '1 is an angular lever 8, said lever being journalled on a pin 8 which traverses said slot. One end portion of the lever B is engaged in an opening ll! which is provided therefor in the plunger 3. 5

A transverse notch H is formed in the upper portion of the bar I at an intermediate point, said notch being intersected by the slot 1. The reference numeral l2 designates an elongated metallic sheet lifting plate which, when in lowered or' 10 inoperative position, rests longitudinally on the bar I. Depending from an intermediate portion of the lifting plate l 2 is a bifurcated lug 53 which is engaged for reciprocation in the notch I l. One end portion of the lever 8 is engaged between the bifurcations of the lug l3 and operativ-ely connected thereto by a pin and slot connection 14. Equalizing coil springs l5 are mounted in recesses l6 which are provided therefor in the upper portion of the bar I and engaged beneath the end portions of the lifting plate l2.

It is thought that the operation of the device will be readily apparent from a consideration of the foregoing, particularly to those skilled in the art of printing. When in use, the device is mounted transversely in the usual chase or form H adjacent the last row of the type Ill. The bed of the press (not shown) moves in a horizontal plane beneath the cylinder of the press l9 in the usual manner. As the trailing end of the sheet being printed approaches the last line of type the plunger 3 is depressed by the tympan of the cylinder against the tension of the coil spring 5, thereby elevating the lifting plate I2 through the medium of the lever B into engagement with said trailing end of the sheet for holding it against the tympan and preventing it from dragging across the type. The coil spring 5 is strong or stiff enough to allow the comparatively soft ink rollers of the press to pass over the plunger 3 Without elevating and consequently inking the lifting plate l2 and by reason of this feature, together with the fact that said plate l2 operated from a single point, the device may be successfully used at any transverse point in chases or forms of various widths. It may also be well to here mention that the spring 5 is stronger than the springs [5 to assure the lowering of the plate l2.

It is believed that the many advantages of a slur preventer for printing presses constructed in accordance with the present invention will be readily understood, and although a preferred embodiment of the device is as'illustrated and described, it is to be understood that changes in the details of construction and in the combination and arrangement of parts may be resorted to which will fall within the scope of the invention as claimed.

What is claimed is:

A slur preventer for printing presses of the type including a cylinder, a bed and a chase mounted on the bed, comprising a bar adapted to be mounted transversely in the chase, said bar having a substantially cylindrical socket in one end portion thereof and further having a longitudinal slot thereincommunicating, at one end, with the socket, said bar still further having a transverse notch therein at an intermediate point communicating with the slot, a lifting plate mounted for vertical movement on the bar, said lifting plate including a depending bifurcated lug at an intermediate point slidably engaged in the notch, equalizing springs mounted in the bar and engaged with the plate on opposite sides of the bifurcated lug, an angular lever pivotally mounted, at an intermediate point, in the slot and operatively connected, at one end, to the lug between the bifurcations thereof, a plunger slidably mounted in the socket and having an opening therein for the reception of the other end portion of the lever for connecting said lever to the plunger for actuation thereby, said plunger being operable by the cylinder of the press for elevating the lifting plate through the medium of the lever, said plunger including a substantially anticlinal head, and a comparatively stiff coil spring mounted in the socket and engaged with the plunger for yieldingly resisting actuation of said plunger by the press cylinder.

DELBERT L. ERV'IN. 

